In the coordinate plane, quadrilateral ABCD has vertices A(-2,3) B(4,5) C(10,-1) and D(8,-9). Let E, F,G, and H be the midpoints of AB, BC, CD and DA, respectively. Prove that quadrilateral EFGH is a parallelogram

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

do your own work and don"t cheat.

step-by-step explanation:

(x,y) it'll always be like that.

in this case x is grams and y is ounces.

if there were numbers there, like (5,3)

x would be 5 and y would be 3.

yes

step-by-step explanation:

(2x+3)(x+5)(x-4)